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https://issues.apache.org/jira/browse/MAPREDUCE-4087?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Graves updated MAPREDUCE-4087:
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    Fix Version/s: 2.0.5-beta

I merged this to branch-2
                
> [Gridmix] GenerateDistCacheData job of Gridmix can become slow in some cases
> ----------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4087
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4087
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Ravi Gummadi
>            Assignee: Ravi Gummadi
>             Fix For: 1.1.0, 3.0.0, 2.0.5-beta
>
>         Attachments: 4087.patch, 4087.trunk.patch
>
>
> In map() method of GenerateDistCacheData job of Gridmix, val.setSize() is 
> done every time based on the bytes to be written to a distributed cache file. 
> When we try to write data to next distributed cache file in the same map 
> task, the size of random data generated in each iteration can become small 
> based on the particular case. This can make this dist cache data generation 
> slow.

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